Brompton Disc Brakes

SONY DSCThe normal brakes on a Brompton are, well, “adequate” – the latest versions are okay, but sometimes more powerful brakes can be a good idea.

I make several brake conversions for the Brompton – fitting disc brakes gives you much more powerful braking, which is also almost completely unaffected by the weather, mud or road dirt. Fitting disc brakes fittings welded on to the frame, but the disc brakes can’t be retrofitted to existing forks, they’re too narrow, so as with the Rohloff Brompton kit I offer several options – either I can convert your existing frame if you send it to me, or I can send you a new frame part with the kit.

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Front Disc Brakes: Don’t forget to tell me which colour you want the frame parts painted. Kit includes a new Hope front wheel, brake caliper, rotor and everything else you need.

Front Spyre Cable Disc Brake, New Forks: £430 Add to your basket
Front Hydraulic Disc Brake, New Forks: £495 Add to your basket

I can also build up the front wheel with a SON Delux hub and add an Edelux II front light and a rear light if you want to add top quality dynamo lighting at the same time, as shown in the above picture.

Front Spyre Cable Disc Brake, New Forks, SON Edelux lighting: £830 Add to your basket
Front Hydraulic Disc Brake, New Forks, SON Edelux lighting: £895 Add to your basket

Rear Disc Brakes: Because the normal Brompton rear frame won’t work with disc brakes, for these kits I’ll assume you’re fitting either my Rohloff Brompton kit or Alfine kit at the same time. So this kit includes only the brake caliper, rotor, and all parts needed to fit with a gearing upgrade kit.

Rear Avid Cable Disc Brake: £75 Add to your basket
Rear Spyre Cable Disc Brake: £110 Add to your basket
Rear Hydraulic Disc Brake: £195 Add to your basket

(I’ve decided to remove the option for a front Avid disc brake – the Avid caliper is bigger, so it can cause problems with folding.)

10 Responses

  1. Hugo Schröder says:

    Is it possible to use your fork with the Brompton Ebike Mini Set from V-fiets in Amsterdam , http://www.v-fiets.com/brompton-ebike-mini-set-317wh , and mount your disc brake or should I pose this question to V-fiets ?

    • admin says:

      That seems similar to the Nano kit. That motor won’t work with a disc brake, but at least with Nano they can do a different motor which is disc-compatible – best ask V-fiets.

  2. Toby Ball says:

    Do the original mudguards still fit or do they need adjusting aswell?

  3. Does the bike still fold like the original fork?

  4. martinf says:

    Disc brake forks on large wheel bikes are generally heavier and stiffer than those for rim brakes in order to cope with the increased force concentrated on one side of the fork. How do you manage to make your disc brake Brompton forks so light?

    • admin says:

      Brompton forks are much smaller than big wheel forks, so the forces are different – it’s not necessary to use special heavy-duty fork blades, though I do use long-tang fork crowns to spread the load.

  5. mag says:

    After a Brompton has the Rohloff kit , front and read disc brakes , plus a gates drive , will the bike fit inside the B&W travel hardcase ?

    • admin says:

      Yes, it still fits – you need to trim the foam padding a bit, and it’s a bit more of a squeeze, but it does fit in.

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